feat(nix): add pre-commit-hooks.nix

Signed-off-by: Sefa Eyeoglu <contact@scrumplex.net>

3 files changed, 111 insertions, 1 deletions

diff --git a/.gitignore b/.gitignore
index 778024e3..635d1c53 100644
--- a/.gitignore
+++ b/.gitignore
@@ -24,6 +24,7 @@ build
 
 # direnv / Nix
 .direnv/
+.pre-commit-config.yaml
 
 # Install dirs
 install
diff --git a/flake.lock b/flake.lock
index a0f503cd..5820e098 100644
--- a/flake.lock
+++ b/flake.lock
@@ -16,6 +16,22 @@
         "type": "github"
       }
     },
+    "flake-compat_2": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1673956053,
+        "narHash": "sha256-4gtG9iQuiKITOjNQQeQIpoIB6b16fm+504Ch3sNKLd8=",
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "rev": "35bb57c0c8d8b62bbfd284272c928ceb64ddbde9",
+        "type": "github"
+      },
+      "original": {
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "type": "github"
+      }
+    },
     "flake-utils": {
       "locked": {
         "lastModified": 1676283394,
@@ -31,6 +47,27 @@
         "type": "github"
       }
     },
+    "gitignore": {
+      "inputs": {
+        "nixpkgs": [
+          "pre-commit-hooks",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1660459072,
+        "narHash": "sha256-8DFJjXG8zqoONA1vXtgeKXy68KdJL5UaXR8NtVMUbx8=",
+        "owner": "hercules-ci",
+        "repo": "gitignore.nix",
+        "rev": "a20de23b925fd8264fd7fad6454652e142fd7f73",
+        "type": "github"
+      },
+      "original": {
+        "owner": "hercules-ci",
+        "repo": "gitignore.nix",
+        "type": "github"
+      }
+    },
     "libnbtplusplus": {
       "flake": false,
       "locked": {
@@ -63,12 +100,55 @@
         "type": "github"
       }
     },
+    "nixpkgs-stable": {
+      "locked": {
+        "lastModified": 1673800717,
+        "narHash": "sha256-SFHraUqLSu5cC6IxTprex/nTsI81ZQAtDvlBvGDWfnA=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "2f9fd351ec37f5d479556cd48be4ca340da59b8f",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-22.11",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "pre-commit-hooks": {
+      "inputs": {
+        "flake-compat": "flake-compat_2",
+        "flake-utils": [
+          "flake-utils"
+        ],
+        "gitignore": "gitignore",
+        "nixpkgs": [
+          "nixpkgs"
+        ],
+        "nixpkgs-stable": "nixpkgs-stable"
+      },
+      "locked": {
+        "lastModified": 1678376203,
+        "narHash": "sha256-3tyYGyC8h7fBwncLZy5nCUjTJPrHbmNwp47LlNLOHSM=",
+        "owner": "cachix",
+        "repo": "pre-commit-hooks.nix",
+        "rev": "1a20b9708962096ec2481eeb2ddca29ed747770a",
+        "type": "github"
+      },
+      "original": {
+        "owner": "cachix",
+        "repo": "pre-commit-hooks.nix",
+        "type": "github"
+      }
+    },
     "root": {
       "inputs": {
         "flake-compat": "flake-compat",
         "flake-utils": "flake-utils",
         "libnbtplusplus": "libnbtplusplus",
-        "nixpkgs": "nixpkgs"
+        "nixpkgs": "nixpkgs",
+        "pre-commit-hooks": "pre-commit-hooks"
       }
     }
   },
diff --git a/flake.nix b/flake.nix
index 3294c799..6173670a 100644
--- a/flake.nix
+++ b/flake.nix
@@ -4,6 +4,11 @@
   inputs = {
     nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
     flake-utils.url = "github:numtide/flake-utils";
+    pre-commit-hooks = {
+      url = "github:cachix/pre-commit-hooks.nix";
+      inputs.nixpkgs.follows = "nixpkgs";
+      inputs.flake-utils.follows = "flake-utils";
+    };
     flake-compat = {
       url = "github:edolstra/flake-compat";
       flake = false;
@@ -18,6 +23,7 @@
     self,
     nixpkgs,
     flake-utils,
+    pre-commit-hooks,
     libnbtplusplus,
     ...
   }: let
@@ -43,12 +49,35 @@
     flake-utils.lib.eachSystem supportedSystems (system: let
       pkgs = nixpkgs.legacyPackages.${system};
     in {
+      checks = {
+        pre-commit-check = pre-commit-hooks.lib.${system}.run {
+          src = ./.;
+          hooks = {
+            markdownlint.enable = true;
+            alejandra.enable = true;
+
+            clang-format = {
+              enable =
+                false; # As most of the codebase is **not** formatted, we don't want clang-format yet
+              types_or = ["c" "c++"];
+            };
+          };
+        };
+      };
+
       packages = let
         packages = packagesFn pkgs;
       in
         packages // {default = packages.prismlauncher;};
 
       devShells.default = pkgs.mkShell {
+        inherit (self.checks.${system}.pre-commit-check) shellHook;
+        packages = with pkgs; [
+          nodePackages.markdownlint-cli
+          alejandra
+          clang-tools
+        ];
+
         inputsFrom = [self.packages.${system}.default];
         buildInputs = with pkgs; [ccache ninja];
       };